There is no technical difference between the two models

Smith high-efficiency units

With a 7/8" suction and 1/2" discharge stub connection

the Reznor 98467 handles the thermal stresses common in heavy-duty commercial heating applications

With a temperature range of 20°F to 120°F and an adjustable differential of 3

Danfoss 120Z0466 Crankcase Heater 319848-301 There is no technical differenceThe Danfoss 120Z0466 is a professional grade belt type crankcase heater engineered specifically for high capacity refrigeration and AC compressors. Operating at 460 volts with a 65 watt power draw, this surface sump heater maintains oil temperature above the refrigerant dew point, effectively preventing liquid migration and ensuring safe startup during low ambient conditions. Designed for versatility, the adjustable belt fits compressor diameters